Rotary tool hand piece



A. A. BAMBERGER ROTARY TOOL HAND PIECE Filed April 22, 1947 Jan. 2, 1951 (Ittorneg Patented Jan. 2, 1951 ROTARY TOOL HAND PIECE;

Alfred A. Bamberger, Flushing, N. Y., assignor to Speedo lidanufacturing Co., Inc., New York,

Application April 22, 1947, Serial No. 743,085

(Cl. i4- 527) 1l Claims.

This invention relates to a rotary tool hand piece of the type that may be connected to a rotary flexible shaft.

An object of this invention is to provide a de vice of the character described which includes a rotating shaft disposed within a casing, having a chuck attached to one end thereof and a flexible shaft coupling attached to the other wherein means is provided for fixing said shaft against rotation when it is desired to insert or remove a tool from the chuck.

Another object of this invention is to provide in a device of the character described a rotatable shaft mounted within a casing, a collar xed on said shaft for rotation therewith and means on the casing which is adapted to engage the collar, upon movement in one direction, thereby `preventing rotation of the shaft.

Still another object of this invention is to provide in a device of the character described, a rotatable shaft mounted within a casing, the said mounting comprising a pair of ball bearings having their outer races fitted in the casing and the inner races disposed in spaced relation on said shaft and maintained in such position by a spacing sleeve disposed on the shaft.

Yet another object of this invention is to provide in a device of the character described, a tubular casing, having internally threaded end portions, a shaft rotatably mounted within the casing, a pair of ball bearings having their inner races disposed in spaced relation on said shaft being separated by a spacing sleeve disposed on the shaft and clamping washers screwed into either end of the casing, said washers engaging outer races of said ball bearings.

Still a further object of this invention is to provide a compact and durable device of the character described which shall be relatively inexpensive to manufacture, easy to manipulate, which shall be smooth and positive operation, and yet practical and efficient to a high degree in use.

Other objects of this invention will in part be obvious and part hereinafter pointed out.

This invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exempliiied in the construction hereinafter described and of which the scope of application will be indicated in the following claims.

In the accompanying drawing, in which is shown one of the various possible illustrative embodiments of this invention:

Fig. 1 is an axial cross-sectional view of a device embodying the invention;

Fig. 2 is a bottom plan view of the connector sleeve portion of the device shown in Fig. 1;

Fig. 3 is a cross-sectional view taken on the line 3-3 of Fis- 1;

Fig. 4 is a cross-sectional `view taken on the line 4-4 of Fig. l;

Fig. 5 is a cross-sectional view taken on the line 5-5 of Fig. l; and

Fig. 6 is a cross-sectional view taken on the line 6-6 of Fig. 1.

Referring now in detail to the drawing, IE! designates a device embodying the invention. The same comprises a tubular casing il having an internally screw threaded open ended portion i2 at its forward end and an internally screw threaded portion I3 at its rearward end. A tapered nose piece HI coaxial with the casing and having an externally threaded rear portion it; of reduced outside diameter, is screwed into the threaded portion `I2 of the casing. The nosepiece I4 is formed with an axial through bore id. A rotatable shaft II is mounted within the casing I having its forward end disposed in the bore i3 of the nosepiece I 4 and the rear end thereof extending short of the rear end of the casing. A portion I8 of the shaft Il disposed within the casing I I is of reduced external diameter, forming a shoulder I9 disposed rearwardly of the threaded portion |2,of the casing I The rear end of the portion I8 of the shaft Il is formed with an axial recess 20 from which extends inwardly an axial threaded recess 2| of a diameter less than that of the recess 20. Extending rearwardly from the end of the shaft portion i8 are a pair of projecting aligned lugs 22. The rear end of the shaft portion |iB is supported by a ball bearing 23 which comprises an inner bearing sleeve 24 formed with an annular groove 25, and force fitted on the shaft portion IB. The sleeve 24 comprises an outwardly extending annular iiange portion 26 at its forward end. The bearing 23 further comprises an outer bearing sleeve 2l force tted within the casing The sleeve 21 is formed with annular recess 28 extending inwardly from the forward end of the sleeve. The recess 23 is disposed opposite the annular groove 25 in the bearing sleeve 24 forming a race way for bearing balls 29. Similarly a ball bearing 38 is disposed on the forward end of the shaft portion |8. The bearing 30 comprises an inner bearing sleeve 3| force fitted on the shaft portion i8 and abutting the shoulder I9. rEhe sleeve 3| is formed with an annular circumferential groove 32. The outer bearing 33 further comprises a sleeve 21a supported by the casing l and formed with an annular ball race 23a disposed opposite the groove 32 in the sleeve 3|, hereby forming a race way for balls 20a. The inner bearing sleeves 24 and 3| are maintained in their positions on the shaft portion i8 by a separating sleeve 33 on the shaft portion i8 and interposed between the bearing sleeves.

The bearings 23 and 3|] are xed in their relative position by means of a clamping washer 34 3 having a screw threaded circumferential portion 35 screwed into the threaded portion l2 of the casing li. The clamping washer Sli is formed with a through opening 35 through which the sleeve 3i passes and is further formed with aligned recesses 3l on its forward surface to permit the use of an appropriate tool for screwing the washer into a position pressing against the outer bearing sleeve 2id. ASimilarly a clamping washer Sila is screwed into the screw threaded portion i3 of the casing Il pressing against the outer bearing sleeve 2. The clamping washer Bric is also formed with a through opening Sea in which is disposed the inner bearing sleeve 2li and with aligned recesses Sla on its rearward surface for receiving a turning tool.

A brass washer 38 and a felt washer 3@ are successively mounted on the sleeve 5! and the shaft Vi being interposed between the clamping washer 31% and the rear end of the portion Yi5 of the housing ifi. The brass washer 35 and the felt washer 39 are adapted to keep dust out of the interior of the casing H. Similar brass and felt washers are disposed on the sleeve 2, and are pressed against the clamping washer Sla by a similar clamping washer 3io screwed into the threaded portion I3 Vof the casing Il.

A sleeve d@ forming a handle and connector member for interconnecting a exible shaft to the shaft il is disposed coaxially with casing li and is screwed into the casing. The sleeve cornprises an intermediate tubular portion dea from which extends a tapered forward portion e i. Extending from the tapered portion di is an externally threaded portion d2 which engages the threaded end portion i3 of the casing ii. The sieeve lo is formed with an annular groove i3 disposed between the tapered portion il and the threaded portion 52. When the sleeve is screwed into the casing Il, the forward end of the tapered portion H abuts the end of the casing Il. The tubular portion ila of the sleeve 4S is formed with a longitudinally disposed through opening dll parallel to the axis of the sleeve extending through the tapered portion il and the threaded portion i2 for the purpose hereinafter described.

Means is provided for locking the shaft il lagainst rotation. To this end, a disc i5 is mounted on the end of the shaft portion i8 of shaft l for rotation therewith. The disc i5 is formed with a vcentrally vlocated key hole slot 'it which engages the projecting lugs 22 on the shaft portion le, thereby preventing rotation of the disc on the shaft. The disc i5 is further formed with oppositely disposed recesses All on the rear face thereof. The recesses 4i on the disc 55 are adapted to be aligned with the opening eli in the sleeve 55. A lock pin or nger i8 is mounted on the sleeve iii for slidablemovement in the opening fill. The lock pin 6.18 comprising a ringer piece @i9 on the rear 'end thereof is formed on an intermediate portion of its upper surface with a pair of spaced, transversely disposed grooves 5G, 5 i. A split circular spring 52 is disposed in the groove d3 of the sleeve 5. The spring 52 is adapted to x the pin le in either its forward or retracted position by engaging the grooves 55 or 5i therein. `Upon pressing the finger piece 49 on the pin et in a forward direction, the end of the pin will project into one of the recesses 4l on the disc do? thus locking the shaft Il against rotation. In this position the lspring 52 engages the groove on the `pin 48, maintaining the pin in such position. When the shaft il is to bedisengaged to permit free rotation thereof, the pin 53 is retracted, the spring 52 permitting the movement of the pin and snapping groove 5i to maintain the pin in its position.

A conventional type of rotary flexible shaft, not shown, is adapted to be connected to the device le for imparting rotary motion to the shaft l1. To this end means is provided lon the device I!) for effecting such a connection. The sleeve il is adapted to removably receive theconnector member on the end of such a flexible shaft and accordingly comprises a rear.- wardly extending enlarged tapered tubular portion 53 from which extends an annular wall 54. The Wall 54 is formed with a through recessed opening 55 in which is seated a ball 55. The ball 55 projects above and below the wall 54. A split spring sleeve 57 formed with a through opening 53 encircles the wall 54. The opening 58 in the sleeve 5l' is of a diameter smaller than that of the ball 55. The sleeve 5l is so disposed on the wall 5? that the ball 56 .projects through the opening 5S therein, yet is maintainedin the recessed opening '55 in the wall 54 of the sleeve.

A shaft extension '59 for receiving the end of the flexible shaft is disposed within the sleeve 40 and is attached to the rear end ofthe shaft portion I8 of the shaft I1. The shaft extension 59 comprises a forwardly extending porti-on 6G of reduced diameter, which is disposed within the recessed portion 2i) of the shaft portion i8 'of the shaft il'. Extending from the portion 50 of the extension is a portion 6| of further reduced di-l ameter which is vexternally screw threaded and engages the threaded' recess-portion 2| of the shaft portion I8. The 'extension 59 is formed with an axial recess 52 extending inwardly from its rear end. The extension 59 is also formed with a longitudinally extending slot 53 which `communicates with the recess 62. lThe end "of flexible shaft which is received in the :recess 62, also includes an upstanding key portion which is adapted to 'engage lthe slot 63 thereby locking the flexible shaft `to the shaft extension.

Ilhe forward 'end of the shaft l1 is formed with an inwardly extending axial recess '54 and also comprises a screw threaded external portion 65. A collet having 4tapered 'outer end portions 55a is disposed within the lrecess '5:4 and la ycoil spring 5l is interposed between the end of the collet and the rear portion of the recess 54. VThe jcolletv 66Mis formed with a plurality of longitudinal slits 53. A sleeve l69 having internally screw threaded portions T5 is screwed 'on to the threaded portion "550i the shaft I1. "h'e sleeve 69 comprises `a head portion 7| disposed outwardlyof the housing f4. The head portion 'I I is formed with tapered inner portions `:'2 which are disposed in abutting relation to the tapered end portion 65a of thecollet v55. pon screwing the' sleeve '89 inwardly, the split portion of the collet are constricted, thereby being adapted 'to grip the 'shank'of a tool placed within the axial portion of the collet. Turning the sleeve '69 lto produce outward movement thereof will loosen the constricted portions of the collet, permitting the tool Yto be removed.

'It is understood that when a tool is to be inserted in the collet 'or to 'be removed therefrom, the operator moves the locking pin 48 into 'engagement with the stop'washer i5 as previously rearward into the rearrnost described. This l'ocl's the Shaft "l against '10- tation while permitting the rotation "of thesleeve '69 to coiistric't or loosen the split 'portions of the collet 66. After the tool has been inserted t and locked in place, the locking pin 48 is retracted thereby permitting the rotation of the shaft l1 through its connection to a rotary flexible shaft which is connected by way of the sleeve 4U.

It will thus be seen that there is provided a device in which the several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiment above set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention I claim as new and desire to secure by Letters Patent:

l. A rotary tool hand piece comprising a casing, a member on said casing coaxial therewith, a rotatable shaft within the casing, chuck means on one end of said shaft, and means slidable on said member in directions parallel to the axis of said shaft for releasably locking said shaft against rotary motion.

2. A rotary tool hand piece comprising a casing, a sleeve on said casing coaxial therewith, a rotatable shaft within the casing, chuck means on one end of said shaft, and means for releasably locking said shaft against rotary motion, said means comprising a member rotatable with the shaft and a member movably mounted on said sleeve for movement in directions parallel to the axis of said shaft and interengaging means on said members.

3. A rotary tool handY piece comprising a casing, a sleeve on said casing coaxial therewith, a rotatable shaft within the casing, chuck means on one end of said shaft, and means for releasably locking said shaft against rotary motion, said means comprising a member rotatable with the shaft and a member movably mounted on said sleeve and interengaging means on said members, means to selectively retain said movable member in engaging and non-engaging positions relative to said rst member.

i. A rotary tool hand piece comprising a casing, a sleeve on said casing coaxial therewith, a rotatable shaft within the casing, chuck means on one end of said shaft, and means on said sleeve for releasably locking said shaft against rotary motion, said locking means comprising a member longitudinally slidable within said casing in directions parallel to the axis of said shaft, a member rotatable with said Shaft, and engageable by said slidable member.

5. A rotary tool hand piece comprising a casing, a sleeve on said casing coaxial therewith, a rotatable shaft within the casing, chuck means on one end of said shaft, and means on said sleeve for releasably locking said shaft against rotary motion, said locking means comprising a member longitudinally slidable within said casing, a member rotatable with said shaft, and engageable by said slidable member, and spring pressed means to selectively retain said slidable member in locking and unlocking positions.

6. A rotary tool hand piece comprising a casing, a sleeve on said casing coaxial therewith, a rotatable shaft within the casing, chuck means on one end of said shaft, and means on said sleeve for releasably locking said shaft against rotary motion, said locking means comprising a member longitudinally slidable within said casing in a direction parallel to the axis of said shaft, a member rotatable with said shaft, and engageable by said slidable member, said rst member having 6 a finger engageable part located utside of the casing.

7. A rotary tool hand piece comprising. a tubular casing, a sleeve on said casing coaxial therewith, a shaft disposed axially of the casing, said shaft including a pair of spaced annular grooved portions forming inner ball bearing races, a pair of outer ball bearing races fitted within said casing, balls-between said inner races and outer races. a chuck at one end of the shaft, means at the other end of the shaft for engaging a flexible rotating drive means, a disc `fixed to said shaft for rotation therewith, and formed with a recess, and a slide slidably mounted on said sleeve for movement parallel to the axis of rotation of said disc and engageable within said recess.

8. A rotary tool hand piece comprising, a tubular casing, a shaft disposed axially of the casing, a sleeve on said casing coaxial therewith said shaft including pair of spaced annular grooved portions forming inner ball bearing races, a pair of outer ball bearing races tted within said casing, balls between said inner races and outer races, a chuck at one end of the shaft, means at the other f end of the shaft for engaging a flexible rotating drive means, a disc xed to said shaft for rotation therewith, and formed with a recess, and a slide slidably mounted on said sleeve for movement parallel to the axis of rotation of said disc and engageable within said recess, said slide having a finger engageable part outside of the sleeve.

9. A rotary tool hand piece comprising a tubular casing, a shaft passing axially through said casing, a pair of sleeves force-fitted on said shaft and spaced from one another, a spacing sleeve on said shaft and between said pair of sleeves, said pair of sleeves being formed with annular grooves forming inner ball bearing races, a pair of outer ball bearing races fitted within said tubular casing, bearing balls between said inner and outer races, means on said casing to press said outer races inwardly toward each other, a chuck at one end of said shaft and means at the other end of said shaft for engaging a exible rotary drive means, a nosepiece at one end of said tubular casing, a sleeve at the other end of said tubular casing and formed with a longitudinal hole, a pin slidably mounted in said hole for movement parallel to the axis of said shaft and a disc mounted on said shaft for rotation therewith and being formed with a recess to receive said slidable pin.

10. A rotary tool hand piece comprising a tubular casing, a shaft passing axially through said casing; a pair of sleeves force-fitted on said shaft and spaced fromsone another, a spacing sleeve on said shaft and between said pair of sleeves, said pair of sleeves being formed with annular grooves forming inner ball bearing races, a pair of outer ball bearing races tted within said tubular casing, bearing balls between said inner and outer races, means on said casing to press said outer races inwardly toward each other, a chuck at one end of said shaft and means at the other end of said shaft for engaging a flexible rotary drive means, a nose piece at one end of said tubular casing, a sleeve at the other end of said tubular casing and formed with a longitudinal hole, a pin slidably mounted in said hole for movement parallel to the axis of said shaft and a disc mounted on said shaft for rotation therewith and being formed with a recess to receive said slidable pin, and spring means to retain said sliding .pin in a position engaging said recess and in aretracted position in .disengagement with -respect to said disc.

11. A rotary .toolhand piece comprising a tubular casing, ashaft passing axially through said leasing; a pair of 7sleeves forcefttedon said :shaft 'and .spaced from .one another, aspacing sleeve .on

saxi'shaitfand .between `said Vpair of sleeves, said pair-.of sleeves being formed with annular Agrooves Storming inner ball bearing races, a pair Lof .outer fba'llbearing races tted within said tubular cas,- ing, :bearing balls :betweensaid inner and outer races, means .on said .casing .to'lpress .saidaouter .races inwardly toward each other, a chuck lat one ,fend .ofi-saidshaft and :means :at the .other end of said shaft for engaging va flexible rotary Adritte mean-s, -a nose piece at Jone .vend of said tubular casing, asleeveat 'the otherend of said tubular ycasingand formed `with alongitudinalhole, a `pin `slidaloly vmounted in said hole Afor movement :parallel .to the axis of `said vshaft and a ydisc mounted on said shaft for rotation .therewith and 20 being formed with a recess to receive sadslidable pin, and spring means to retain said sliding-pin -in a .position engaging said recess and in .a retracted .position in disengagement with respect to said disc, and said pin being formed with a finger en: gaging part located externally of saidsleeye.

ALFRED A. BAMBERGER.

REFERENCES @TED T119 Molloy/113g references are vof record inthe ,file of this patent:

UNITED STATES VPA'IENI'S 

